How to hide the PTR record in the URL, and be able to send letters?

How to hide the PTR record in the URL, and be able to send letters?

  1. ~# nano /etc/ssmtp/ssmtp.conf
root=support@domain.ru
mailhub=smtp.zoho.com:587
hostname=domain.ru
UseSTARTTLS=YES
AuthUser=support@domain.ru
AuthPass=password
FromLineOverride=YES
UseTLS=YES
rewriteDomain=zoho.com

~# nano /etc/ssmtp/revaliases
root:support@domain.ru:smtp.zoho.com:587
 

     
 
  1.  ~# echo "Hello" | mail -s "Ulala" sendemail@mail.ru
    2. 

 

     
 
  1.  

    553 Relaying disallowed as "root" <root@myhost.ru>
    2. 

 

myhost.ru - PTR-record